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Finding the Fourth Proportional to 1,243.84, 1,864.45 and 421.82

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Solution

The fourth proportional to 1,243.84, 1,864.45 and 421.82 is: 632.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.84 : 1,864.45 = 421.82 : x
  2. Step 2: Convert to fraction form
    1,243.84/1,864.45 = 421.82/x
  3. Step 3: Cross multiply
    1,243.84x = 1,864.45 × 421.82
  4. Step 4: Simplify right side
    1,243.84x = 786,470.98
  5. Step 5: Solve for x
    x = 786,470.98/1,243.84
  6. Step 6: Final answer
    x = 632.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.